纳米Al_(2)O_(3)颗粒对植物绝缘油微观特性影响的分子模拟研究

Molecular Simulation Study on Effect of Nano-Al_(2)O_(3) Particle onMicro Characteristics of Vegetable Insulating Oil

采用分子模拟的方法研究了纳米Al_(2)O_(3)对植物绝缘油微观特性的影响,并通过试验加以验证。对纳米Al_(2)O_(3)与植物油分子的表面相互作用机理进行了分析,建立了未改性和改性后的植物油模型,研究分析其中的氢键、油分子的径向分布函数(RDF)和水分子的扩散系数等参数,同时对不同改性浓度纳米Al_(2)O_(3)的植物油进行了热老化实验。结果表明:改性植物油模型中的氢键数量更多,RDF的峰值更大,水分子的扩散系数更小。热老化过程中改性油的介质损耗小于未改性油,表明纳米Al_(2)O_(3)改性植物绝缘油具有优良的稳定性,改性植物绝缘油的热稳定性和绝缘性能得到增强。

The effect of nano-Al_(2)O_(3) on the microscopic properties of vegetable insulating oil was studied by molecular simulation,and its result was verified by tests.The mechanism of surface interaction between nano-Al_(2)O_(3) and vegetable insulating oil molecules was analyzed,models of vegetable insulating oil before and after nano-Al2O3 modification were established.The hydrogen bond,radial distribution function(RDF)of oil molecule,and diffusion coefficient of water molecule were studied,and the thermal ageing experiment was conducted on vegetable insulating oils with different concentration of nano-Al_(2)O_(3).The results show that compared with the vegetable insulating oil without modification,there are more hydrogen bonds in the modified vegetable insulating model,the peak value of RDF is greater,and the diffusion coefficient of water molecules is smaller.In the process of thermal ageing,the dielectric loss of the modified oil is smaller than that of the unmodified oil,which shows that the nano-Al_(2)O_(3) modified vegetable insulating oil has excellent stability,and its thermal stability and insulation performance are enhanced.